Usage History of 'tornado'

The following chart shows how frequently 'tornado' appeared in printed materials over time. For example, the word 'tornado' occurred 2 times in books in 1524 and 59,158 times in 2008. From 1524 to 2008, the word 'tornado' was used a total of 1,173,882 times in books scanned by Google. See Reference: Google Ngram project.

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